Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynx
TM
: Non-Isolated DC-DC Power Modules
3Vdc –14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A Output Current
*
UL is a registered trademark of Underwriters Laboratories, Inc.
†
CSA is a registered trademark of Canadian Standards Association.
‡
VDE is a trademark of Verband Deutscher Elektrotechniker e.V.
Document No: DS10-010 ver. 0.21
** ISO is a registered trademark of the International Organization of Standards
PDF name: UDT020A0X.
p
df
Features
Compliant to RoHS EU Directive 2002/95/EC (Z
versions)
Compatible in a Pb-free or SnPb reflow
environment (Z versions)
DOSA based
Wide Input voltage range (3Vdc-14.4Vdc)
Output voltage programmable from 0.45Vdc to
5.5Vdc via external resistor and PMBus
TM #
Digital interface through the PMBus
TM #
protocol
Tunable Loop
TM
to optimize dynamic output
voltage response
Flexible output voltage sequencing EZ-
SEQUENCE
Power Good signal
Fixed switching frequency with capability of
external synchronization
Output over current protection (non-latching)
Over temperature protection
Remote On/Off
Ability to sink and source current
Cost efficient open frame design
Small size: 20.32 mm x 11.43 mm x 8.5 mm
(0.8 in x 0.45 in x 0.334 in)
Wide operating temperature range [-40°C to 85°C]
UL* 60950-1 2
nd
Ed. Recognized, CSA
†
C22.2
No. 60950-1-07 Certified, and VDE
‡
(EN60950-1
2
nd
Ed.) Licensed
ISO** 9001 and ISO 14001 certified
manufacturing facilities
Applications
Distributed power architectures
Intermediate bus voltage applications
Telecommunications equipment
Servers and storage applications
Networking equipment
Industrial equipment
Description
The 20A Digital Micro DLynx
TM
power modules are non-isolated dc-dc converters that can deliver up to 20A of
output current. These modules operate over a wide range of input voltage (V
IN
= 3Vdc-14.4Vdc) and provide a
precisely regulated output voltage from 0.6Vdc to 5.5Vdc, programmable via an external resistor and PMBus
TM #
control. Features include a digital interface using the PMBus
TM #
protocol, remote On/Off, adjustable output
voltage, over current and over temperature protection. The PMBus
TM #
interface supports a range of commands to
both control and monitor the module. The module also includes the Tunable Loop
TM
feature that allows the user to
optimize the dynamic response of the converter to match the load with reduced amount of output capacitance
leading to savings on cost and PWB area.
TRIM
VOUT
VS+
GND
RTUNE
CTUNE
RTrim
VIN
Co
Cin
Vout+Vin+
ON/OFF
SEQ
MODULE
PGOOD
SMBALRT#
SIG_GND
A
DDR1
RADDR0
CLK
DATA
A
DDR0
VS-
RADDR1
GND
SYNC
RoHS Com
p
liant
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 2
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are
absolute stress ratings only, functional operation of the device is not implied at these or any other conditions in
excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for
extended periods can adversely affect the device reliability.
Parameter Device Symbol Min Max Unit
Input Voltage All VIN -0.3 15 V
Continuous
SEQ, SYNC, VS+ All 7 V
CLK, DATA, SMBALERT All 3.6 V
Operating Ambient Temperature All TA -40 85 °C
(see Thermal Considerations section)
Storage Temperature All Tstg -55 125 °C
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Parameter Device Symbol Min Typ Max Unit
Operating Input Voltage All VIN 3
⎯ 14.4 Vdc
Maximum Input Current All IIN,max 19 Adc
(VIN=3V to 14V, IO=IO, max )
Input No Load Current
(VIN = 12Vdc, IO = 0, module enabled)
VO,set = 0.6 Vdc IIN,No load 69 mA
VO,set = 5Vdc IIN,No load 134 mA
Input Stand-by Current
(VIN = 12Vdc, module disabled) All IIN,stand-by 16.4 mA
Inrush Transient All I2t 1 A2s
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 1H source impedance; VIN =0 to
14V, IO= IOmax ; See Test Configurations)
All 50 mAp-p
Input Ripple Rejection (120Hz) All -64 dB
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 3
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set-point (with 0.1% tolerance for
external resistor used to set output voltage) All VO, set -1.0 +1.0 % VO, set
Output Voltage (Over all operating input voltage, resistive
load, and temperature conditions until end of life) All VO, set -3.0 ⎯ +3.0 % VO, set
Adjustment Range (selected by an external resistor)
(Some output voltages may not be possible depending
on the input voltage – see Feature Descriptions Section)
All VO 0.6 5.5 Vdc
PMBus Adjustable Output Voltage Range All VO,adj -25 0 +25 %VO,set
PMBus Output Voltage Adjustment Step Size All 0.4 %VO,set
Remote Sense Range All 0.5 Vdc
Output Regulation (for VO 2.5Vdc)
Line (VIN=VIN, min to VIN, max) All
⎯ +0.4 % VO, set
Load (IO=IO, min to IO, max) All
⎯ 10 mV
Output Regulation (for VO < 2.5Vdc)
Line (VIN=VIN, min to VIN, max) All
⎯ 5 mV
Load (IO=IO, min to IO, max) All
⎯ 10 mV
Temperature (Tref=TA, min to TA, max) All
⎯ 0.4 % VO, set
Output Ripple and Noise on nominal output
(VIN=VIN, nom and IO=IO, min to IO, max Co = 0.1F // 22 F
ceramic capacitors)
Peak-to-Peak (5Hz to 20MHz bandwidth) All ⎯ 50 100 mVpk-pk
RMS (5Hz to 20MHz bandwidth) All 20 38 mVrms
External Capacitance1
Without the Tunable LoopTM
ESR 1 m All CO, max 2x47 ⎯ 2x47 F
With the Tunable LoopTM
ESR 0.15 m All CO, max 2x47 ⎯ 1000 F
ESR 10 m All CO, max 2x47 ⎯ 10000 F
Output Current (in either sink or source mode) All Io 0 20 Adc
Output Current Limit Inception (Hiccup Mode)
(current limit does not operate in sink mode) All IO, lim 130 % Io,max
Output Short-Circuit Current All IO, s/c 1.4 A
(VO250mV) ( Hiccup Mode )
PMBus Output Current Measurement Accuracy All TBD
Efficiency VO,set = 0.6Vdc 79.2 %
VIN= 12Vdc, TA=25°C VO, set = 1.2Vdc 87.1 %
IO=IO, max , VO= VO,set V
O,set = 1.8Vdc 90.4 %
V
O,set = 2.5Vdc 92.6 %
V
O,set = 3.3Vdc 93.8 %
V
O,set = 5.0Vdc 95.2 %
Switching Frequency All fsw ⎯ 500 ⎯ kHz
1 External capacitors may require using the new Tunable LoopTM feature to ensure that the module is stable as well as
getting the best transient response. See the Tunable LoopTM section for details.
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 4
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Frequency Synchronization All
Synchronization Frequency Range All 425 600 kHz
High-Level Input Voltage All VIH 2.0 V
Low-Level Input Voltage All VIL 0.4 V
Input Current, SYNC All ISYNC 100 nA
Minimum Pulse Width, SYNC All tSYNC 100 ns
Maximum SYNC rise time All tSYNC_SH 100 ns
General Specifications
Parameter Device Min Typ Max Unit
Calculated MTBF (IO=0.8IO, max, TA=40°C) Telecordia Issue 2
Method 1 Case 3 All 15,455,614 Hours
Weight
⎯ 4.54 (0.16) ⎯ g (oz.)
Feature Specifications
Unless otherwise indicated, specifications apply overall operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions for additional information.
Parameter Device Symbol Min Typ Max Unit
On/Off Signal Interface
(VIN=VIN, min to VIN, max ; open collector or equivalent,
Signal referenced to GND)
Device code with suffix “4” – Positive Logic (See Ordering
Information)
Logic High (Module ON)
Input High Current All IIH ⎯ 1 mA
Input High Voltage All VIH 2 ⎯ VIN,max V
Logic Low (Module OFF)
Input Low Current All IIL ⎯ ⎯ 1 mA
Input Low Voltage All VIL -0.2 ⎯ 0.6 V
Device Code with no suffix – Negative Logic (See Ordering
Information)
(On/OFF pin is open collector/drain logic input with
external pull-up resistor; signal referenced to GND)
Logic High (Module OFF)
Input High Current All IIH 1 mA
Input High Voltage All VIH 2 V
IN, max Vdc
Logic Low (Module ON)
Input low Current All IIL 10 A
Input Low Voltage All VIL -0.2 0.6 Vdc
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 5
Feature Specifications (cont.)
Parameter Device Symbol Min Typ Max Units
Turn-On Delay and Rise Times
(VIN=VIN, nom, IO=IO, max , VO to within ±1% of steady state)
Case 1: On/Off input is enabled and then input power is
applied (delay from instant at which VIN = VIN, min until Vo =
10% of Vo, set)
All Tdelay 1.2 msec
Case 2: Input power is applied for at least one second and
then the On/Off input is enabled (delay from instant at
which Von/Off is enabled until Vo = 10% of Vo, set) All Tdelay 0.8 msec
Output voltage Rise time (time for Vo to rise from
10% of Vo, set to 90% of Vo, set)
All Trise 2.7 msec
Output voltage overshoot (TA = 25oC
VIN= VIN, min to VIN, max,IO = IO, min to IO, max)
With or without maximum external capacitance
3.0 % VO, set
Over Temperature Protection
(See Thermal Considerations section) All Tref 120 °C
PMBus Over Temperature Warning Threshold All TWARN 130 °C
Tracking Accuracy (Power-Up: 2V/ms) All VSEQ –Vo 100 mV
(Power-Down: 2V/ms) All VSEQ –Vo 100 mV
(VIN, min to VIN, max; IO, min to IO, max VSEQ < Vo)
Input Undervoltage Lockout
Turn-on Threshold All 3.25 Vdc
Turn-off Threshold All 2.6 Vdc
Hysteresis All
0.25 Vdc
PMBus Adjustable Input Under Voltage Lockout Thresholds All 2.5 14 Vdc
Resolution of Adjustable Input Under Voltage Threshold All 500 mV
PGOOD (Power Good)
Signal Interface Open Drain, Vsupply ≤ 5VDC
Overvoltage threshold for PGOOD ON 108 %VO, set
Overvoltage threshold for PGOOD OFF 105 %VO, set
Undervoltage threshold for PGOOD ON 110 %VO, set
Undervoltage threshold for PGOOD OFF 90 %VO, set
Pulldown resistance of PGOOD pin All 50
Ω
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 6
Digital Interface Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions for additional information.
Parameter Conditions Symbol Min Typ Max Unit
PMBus Signal Interface Characteristics
Input High Voltage (CLK, DATA) VIH 2.1 3.6 V
Input Low Voltage (CLK, DATA) VIL 0.8 V
Input high level current (CLK, DATA) IIH -10 10
μA
Input low level current (CLK, DATA) IIL -10 10
μA
Output Low Voltage (CLK, DATA, SMBALERT#) IOUT=2mA VOL 0.4 V
Output high level open drain leakage current
(DATA, SMBALERT#) VOUT=3.6V IOH 0 10
μA
Pin capacitance CO 0.7 pF
PMBus Operating frequency range Slave Mode FPMB 10 400 kHz
Data hold time
Receive Mode
Transmit Mode tHD:DAT 0
300 ns
Data setup time tSU:DAT 250 ns
Measurement System Characteristics
Read delay time tDLY 153 192 231 s
Output current measurement range IRNG 0 26 A
Output current measurement resolution IRES 62.5 mA
Output current measurement gain accuracy IACC TBD %
Output current measurement offset IOFST TBD A
VOUT measurement range VOUT(rng) 0 5.5 V
VOUT measurement resolution VOUT(res) 16.25 mV
VOUT measurement gain accuracy VOUT(gain) -2 2 LSB
VOUT measurement offset VOUT(ofst) -3 3 LSB
VIN measurement range VIN(rng) 0 14.4 V
VIN measurement resolution VIN(res) 32.5 mV
VIN measurement gain accuracy VIN(gain) -2 2 LSB
VIN measurement offset VIN(ofst) -5.5 1.4 LSB
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 7
Characteristic Curves
The following figures provide typical characteristics for the 20A Digital Micro DLynxTM at 0.6Vo and 25oC.
EFFICIENCY, η (%)
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, IO (A) AMBIENT TEMPERATURE, TA OC
Figure 1. Converter Efficiency versus Output Current. Figure 2. Derating Output Current versus Ambient
Temperature and Airflow.
OUTPUT VOLTAGE
VO (V) (10mV/div)
OUTPUT
CURRENT
,
OUTPUT
VOLTAGE
IO (A) (10Adiv) VO (V) (10mV/div)
TIME, t (1μs/div) TIME, t (20μs /div)
Figure 3. Typical output ripple and noise (CO=2x47μF
ceramic, VIN = 12V, Io = Io,max, ).
Figure 4. Transient Response to Dynamic Load
Change from 50% to 100% at 12Vin, Cout= 1x47uF
+11x330uF CTune=47nF
,
RTune=178 ohms
OUTPUT VOLTAGE ON/OFF VOLTAGE
VO (V) (200mV/div) VON/OFF (V) (5V/div)
OUTPUT VOLTAGE INPUT VOLTAGE
VO (V) (200mV/div) VIN (V) (5V/div)
TIME, t (2ms/div) TIME, t (2ms/div)
Figure 5. Typical Start-up Using On/Off Voltage (Io=
Io,max).
Figure 6. Typical Start-up Using Input Voltage (VIN =
12V, Io = Io,max).
50
55
60
65
70
75
80
85
90
0 5 10 15 20
Vin=3.3V
Vin=14V
Vin=12V
2
6
10
14
18
22
55 65 75 85 95 105
0.5m/s
(100LFM)
1.5m/s
(300LFM)
1m/s
(
200LFM
)
NC
2m/s
(400LFM)
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 8
Characteristic Curves
The following figures provide typical characteristics for the 20A Digital Micro DLynxTM at 1.2Vo and 25oC.
EFFICIENCY, η (%)
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, IO (A) AMBIENT TEMPERATURE, TA OC
Figure 7. Converter Efficiency versus Output Current. Figure 8. Derating Output Current versus Ambient
Temperature and Airflow.
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT
CURRENT
,
OUTPUT
VOLTAGE
IO (A) (10Adiv) VO (V) (20mV/div)
TIME, t (1μs/div) TIME, t (20μs /div)
Figure 9. Typical output ripple and noise (CO=2x47μF
ceramic, VIN = 12V, Io = Io,max, ).
Figure 10. Transient Response to Dynamic Load
Change from 50% to 100% at 12Vin, Cout= 1x47uF
+5x330uF, CTune=10nF & RTune=178 ohms
OUTPUT VOLTAGE ON/OFF VOLTAGE
VO (V) (500mV/div) VON/OFF (V) (5V/div)
OUTPUT VOLTAGE INPUT VOLTAGE
VO (V) (500mV/div) VIN (V) (5V/div)
TIME, t (2ms/div) TIME, t (2ms/div)
Figure 1. Typical Start-up Using On/Off Voltage (Io=
Io,max).
Figure 12. Typical Start-up Using Input Voltage (VIN =
12V, Io = Io,max).
50
55
60
65
70
75
80
85
90
95
0 5 10 15 20
Vin=3.3V
Vin=14V
Vin=12V
2
6
10
14
18
22
55 65 75 85 95 105
2m/s
(400LFM)
1.5m/s
(300LFM)
1m/s
(200LFM)
0.5m/s
(100LFM)
NC
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 9
Characteristic Curves
The following figures provide typical characteristics for the 20A Digital Micro DLynxTM at 1.8Vo and 25oC.
EFFICIENCY, η (%)
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, IO (A) AMBIENT TEMPERATURE, TA OC
Figure 13. Converter Efficiency versus Output Current. Figure 14. Derating Output Current versus Ambient
Temperature and Airflow.
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT
CURRENT
,
OUTPUT
VOLTAGE
IO (A) (10Adiv) VO (V) (20mV/div)
TIME, t (1μs/div) TIME, t (20μs /div)
Figure 15. Typical output ripple and noise (CO=2X47μF
ceramic, VIN = 12V, Io = Io,max, ).
Figure 16. Transient Response to Dynamic Load
Change from 50% to 100% at 12Vin, Cout= 2x47uF
+3x330uF, CTune=5600pF & RTune=220 ohms
OUTPUT VOLTAGE ON/OFF VOLTAGE
VO (V) (500mV/div) VON/OFF (V) (5V/div)
OUTPUT VOLTAGE INPUT VOLTAGE
VO (V) (500mV/div) VIN (V) (5V/div)
TIME, t (2ms/div) TIME, t (2ms/div)
Figure 17. Typical Start-up Using On/Off Voltage (Io =
Io,max).
Figure 18. Typical Start-up Using Input Voltage (VIN =
12V, Io = Io,max).
70
75
80
85
90
95
0 5 10 15 20
Vin=3.3V
Vin=14V
Vin=12V
2
6
10
14
18
22
55 65 75 85 95 105
2m/s
(400LFM)
1.5m/s
(300LFM)
1m/s
(200LFM)
0.5m/s
(100LFM)
NC
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 10
Characteristic Curves
The following figures provide typical characteristics for the 20A Digital Micro DLynxTM at 2.5Vo and 25oC.
EFFICIENCY, η (%)
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, IO (A) AMBIENT TEMPERATURE, TA OC
Figure 19. Converter Efficiency versus Output Current. Figure 20. Derating Output Current versus Ambient
Temperature and Airflow.
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT
CURRENT
,
OUTPUT
VOLTAGE
IO (A) (10Adiv) VO (V) (20mV/div)
TIME, t (1μs/div) TIME, t (20μs /div)
Figure 21. Typical output ripple and noise (CO=2x47μF
ceramic, VIN = 12V, Io = Io,max, ).
Figure 22. Transient Response to Dynamic Load
Change from 50% to 100% at 12Vin, Cout= 2x47uF
+2x330uF, CTune=3300pF & RTune=220 ohms
OUTPUT VOLTAGE ON/OFF VOLTAGE
VO (V) (1V/div) VON/OFF (V) (5V/div)
OUTPUT VOLTAGE INPUT VOLTAGE
VO (V) (1V/div) VIN (V) (5V/div)
TIME, t (2ms/div) TIME, t (2ms/div)
Figure 23. Typical Start-up Using On/Off Voltage (Io =
Io,max).
Figure 24. Typical Start-up Using Input Voltage (VIN =
12V, Io = Io,max).
70
75
80
85
90
95
100
0 5 10 15 20
Vin=4.5V Vin=14V
Vin=12V
2
6
10
14
18
22
55 65 75 85 95 105
2m/s
(400LFM)
1.5m/s
(300LFM)
1m/s
(200LFM)
0.5m/s
(100LFM)
NC
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 11
Characteristic Curves
The following figures provide typical characteristics for the 20A Digital Micro DLynxTM at 3.3Vo and 25oC.
EFFICIENCY, η (%)
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, IO (A) AMBIENT TEMPERATURE, TA OC
Figure 25. Converter Efficiency versus Output Current. Figure 26. Derating Output Current versus Ambient
Temperature and Airflow.
OUTPUT VOLTAGE
VO (V) (50mV/div)
OUTPUT
CURRENT
,
OUTPUT
VOLTAGE
IO (A) (10Adiv) VO (V) (50mV/div)
TIME, t (1μs/div) TIME, t (20μs /div)
Figure 27. Typical output ripple and noise (CO=2x47μF
ceramic, VIN = 12V, Io = Io,max, ).
Figure 28 Transient Response to Dynamic Load
Change from 50% to 100% at 12Vin, Cout= 5x47uF
+1x330uF, CTune=2200pF & RTune=220 ohms
OUTPUT VOLTAGE ON/OFF VOLTAGE
VO (V) (1V/div) VON/OFF (V) (5V/div)
OUTPUT VOLTAGE INPUT VOLTAGE
VO (V) (1V/div) VIN (V) (5V/div)
TIME, t (2ms/div) TIME, t (2ms/div)
Figure 29. Typical Start-up Using On/Off Voltage (Io =
Io,max).
Figure 30. Typical Start-up Using Input Voltage (VIN =
12V, Io = Io,max).
70
75
80
85
90
95
100
0 5 10 15 20
Vin=4.5V
Vin=14V
Vin=12V
2
6
10
14
18
22
55 65 75 85 95 105
2m/s
(400LFM)
1.5m/s
(300LFM)
1m/s
(200LFM)
0.5m/s
(100LFM)
NC
2m/s
(400LFM)
1.5m/s
(300LFM)
1m/s
(200LFM)
0.5m/s
(100LFM)
NC
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 12
Characteristic Curves
The following figures provide typical characteristics for the 20A Digital Micro DLynxTM at 5Vo and 25oC.
EFFICIENCY, η (%)
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, IO (A) AMBIENT TEMPERATURE, TA OC
Figure 31. Converter Efficiency versus Output Current. Figure 32. Derating Output Current versus Ambient
Temperature and Airflow.
OUTPUT VOLTAGE
VO (V) (50mV/div)
OUTPUT
CURRENT
,
OU
TPUT
VOLTAGE
IO (A) (10Adiv) VO (V) (50mV/div)
TIME, t (1μs/div) TIME, t (20μs /div)
Figure 33. Typical output ripple and noise (CO=2x47μF
ceramic, VIN = 12V, Io = Io,max, ).
Figure 34. Transient Response to Dynamic Load
Change from 50% to 100% at 12Vin, Cout= 8x47uF,
CTune=1500pF & RTune=220 ohms
OUTPUT VOLTAGE ON/OFF VOLTAGE
VO (V) (2V/div) VON/OFF (V) (5V/div)
OUTPUT VOLTAGE INPUT VOLTAGE
VO (V) (2V/div) VIN (V) (5V/div)
TIME, t (2ms/div) TIME, t (2ms/div)
Figure 35. Typical Start-up Using On/Off Voltage (Io =
Io,max).
Figure 36. Typical Start-up Using Input Voltage (VIN =
12V, Io = Io,max).
70
75
80
85
90
95
100
0 5 10 15 20
Vin=7V
Vin=12V
Vin=14V
2
6
10
14
18
22
55 65 75 85 95 105
2m/s
(400LFM)
1.5m/s
(300LFM)
1m/s
(200LFM)
0.5m/s
(100LFM)
NC
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 13
Design Considerations
Input Filtering
The 20A Digital Micro DLynxTM module should be
connected to a low ac-impedance source. A highly
inductive source can affect the stability of the
module. An input capacitance must be placed
directly adjacent to the input pin of the module, to
minimize input ripple voltage and ensure module
stability.
To minimize input voltage ripple, ceramic capacitors
are recommended at the input of the module. Figure
37 shows the input ripple voltage for various output
voltages at 20A of load current with 2x22 µF or 3x22
µF ceramic capacitors and an input of 12V.
Input Ripple Voltage (mVp-p)
Output Voltage (Vdc)
Figure 37. Input ripple voltage for various
output voltages with 2x22 µF or 3x22 µF ceramic
capacitors at the input (20A load). Input voltage
is 12V.
Output Filtering
These modules are designed for low output ripple
voltage and will meet the maximum output ripple
specification with 0.1 µF ceramic and 2x47 µF ceramic
capacitors at the output of the module. However,
additional output filtering may be required by the
system designer for a number of reasons. First, there
may be a need to further reduce the output ripple and
noise of the module. Second, the dynamic response
characteristics may need to be customized to a
particular load step change.
To reduce the output ripple and improve the dynamic
response to a step load change, additional
capacitance at the output can be used. Low ESR
polymer and ceramic capacitors are recommended to
improve the dynamic response of the module. Figure
38 provides output ripple information for different
external capacitance values at various Vo and a full
load current of 20A. For stable operation of the
module, limit the capacitance to less than the
maximum output capacitance as specified in the
electrical specification table. Optimal performance of
the module can be achieved by using the Tunable
LoopTM feature described later in this data sheet.
Figure 38. Output ripple voltage for various output
voltages with external 2x47 µF, 4x47 µF or 6x47 µF
ceramic capacitors at the output (20A load). Input
voltage is 12V.
Safety Considerations
For safety agency approval the power module must be
installed in compliance with the spacing and
separation requirements of the end-use safety agency
standards, i.e., UL 60950-1 2nd, CSA C22.2 No.
60950-1-07, DIN EN 60950-1:2006 + A11 (VDE0805
Teil 1 + A11):2009-11; EN 60950-1:2006 + A11:2009-
03.
For the converter output to be considered meeting the
requirements of safety extra-low voltage (SELV), the
input must meet SELV requirements. The power
module has extra-low voltage (ELV) outputs when all
inputs are ELV.
The UDT020A0X series were tested using an external
Littelfuse 456 series fast-acting fuse rated at 30 A, 100
Vdc in the ungrounded input.
0
50
100
150
200
250
300
350
400
450
0.511.522.533.544.55
2x22uF
3x22 uF
0
10
20
30
40
50
60
70
0.511.522.533.544.55
Ripple (mVp-p)
Output Voltage(Volts)
2x47uF Ext Cap
4x47uF Ext Cap
6x47uF Ext Cap
8x47uF Ext Cap
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 14
Analog Feature Descriptions
Remote On/Off
The module can be turned ON and OFF either by
using the ON/OFF pin (Analog interface) or through
the PMBus interface (Digital). The module can be
configured in a number of ways through the PMBus
interface to react to the two ON/OFF inputs:
• Module ON/OFF can be controlled only
through the analog interface (digital interface
ON/OFF commands are ignored)
• Module ON/OFF can be controlled only
through the PMBus interface (analog
interface is ignored)
• Module ON/OFF can be controlled by either
the analog or digital interface
The default state of the module (as shipped from the
factory) is to be controlled by the analog interface only.
If the digital interface is to be enabled, or the module is
to be controlled only through the digital interface, this
change must be made through the PMBus. These
changes can be made and written to non-volatile
memory on the module so that it is remembered for
subsequent use.
Analog On/Off
The 20A Digital Micro DLynxTM power modules feature
an On/Off pin for remote On/Off operation. Two
On/Off logic options are available. In the Positive
Logic On/Off option, (device code suffix “4” – see
Ordering Information), the module turns ON during a
logic High on the On/Off pin and turns OFF during a
logic Low. With the Negative Logic On/Off option, (no
device code suffix, see Ordering Information), the
module turns OFF during logic High and ON during
logic Low. The On/Off signal should be always
referenced to ground. For either On/Off logic option,
leaving the On/Off pin disconnected will turn the
module ON when input voltage is present.
For positive logic modules, the circuit configuration for
using the On/Off pin is shown in Figure 39. When the
external transistor Q2 is in the OFF state, the internal
transistor Q7 is turned OFF, which keeps Q6 OFF and
Q5 OFF. This allows the internal PWM #Enable signal
to be pulled up by the internal 3.3V, thus turning the
module ON. When transistor Q2 is turned ON, the
On/Off pin is pulled low, which turns Q7, Q6 and Q5
ON and the internal PWM #Enable signal is pulled low
and the module is OFF. A suggested value for Rpullup is
20kΩ.
For negative logic On/Off modules, the circuit
configuration is shown in Fig. 40. The On/Off pin
should be pulled high with an external pull-up resistor
(suggested value for the 3V to 14V input range is
20Kohms). When transistor Q2 is in the OFF state, the
On/Off pin is pulled high, transistor Q3 is turned ON.
This turns Q6 ON, followed by Q5 turning ON which
pulls the internal ENABLE low and the module is OFF.
To turn the module ON, Q2 is turned ON pulling the
On/Off pin low, turning transistor Q3 OFF, which keeps
Q6 and Q5 OFF resulting in the PWM Enable pin
going high.
Digital On/Off
Please see the Digital Feature Descriptions
section.
Figure 39. Circuit configuration for using positive
On/Off logic.
Figure 40. Circuit configuration for using negative
On/Off logic.
Monotonic Start-up and Shutdown
The module has monotonic start-up and shutdown
behavior for any combination of rated input voltage,
output current and operating temperature range.
Startup into Pre-biased Output
The module can start into a prebiased output as long
as the prebias voltage is 0.5V less than the set output
voltage.
Analog Output Voltage Programming
The output voltage of the module is programmable to
any voltage from 0.6dc to 5.5Vdc by connecting a
resistor between the Trim and SIG_GND pins of the
module. Certain restrictions apply on the output
voltage set point depending on the input voltage.
These are shown in the Output Voltage vs. Input
Voltage Set Point Area plot in Fig. 41. The Upper Limit
curve shows that for output voltages lower than 1V, the
input voltage must be lower than the maximum of
14.4V. The Lower Limit curve shows that for output
voltages higher than 0.6V, the input voltage needs to
3.3V
2K
ENABLE
20K
Q2
22K
22K
Rpullup
+VIN
GND
_
+
ON/OFF
V
ON/OFF
I
DLYNX MODULE
Q5
20K
Q7 10K
100K
Q6 20K
GND
V
_
+
I
ON/OFF
20K
ON/OFF
3.3V
DLYNX MODULE
Q5
20K
10K
20K
100K
ENABLE
Q6
2K
Q2
22K
Q3
22K
Rpullup
+VIN
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynx
TM
: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
be larger than the minimum of 3V. .
Figure 41. Output Voltage vs. Input Voltage Set
Point Area plot showing limits where the output
voltage can be set for different input voltages.
V
O
(+)
TRIM
VS
R
trim
LOAD
V
IN
(+)
ON/OFF
VS+
SIG_GND
Caution – Do not connect SIG_GND to GND
elsewhere in the layout
Figure 42. Circuit configuration for programming
output voltage using an external resistor.
Without an external resistor between Trim and
SIG_GND pins, the output of the module will be
0.6Vdc. To calculate the value of the trim resistor,
Rtrim for a desired output voltage, should be as per
the following equation:
()
Ω
−
=k
Vo
Rtrim 6.0
12
Rtrim is the external resistor in k
Vo is the desired output voltage.
Table 1 provides Rtrim values required for some
common output voltages.
Table 1
V
O, set
(V) Rtrim (KΩ)
0.6 Open
0.9 40
1.0 30
1.2 20
1.5 13.33
1.8 10
2.5 6.316
3.3 4.444
5.0 2.727
Digital Output Voltage Adjustment
Please see the Digital Feature Descriptions
section.
Remote Sense
The power module has a Remote Sense feature to
minimize the effects of distribution losses by regulating
the voltage at the SENSE pin. The voltage between
the SENSE pin and VOUT pin should not exceed 0.5V.
Analog Voltage Margining
Output voltage margining can be implemented in the
module by connecting a resistor, R
margin-up
, from the
Trim pin to the ground pin for margining-up the output
voltage and by connecting a resistor, R
margin-down
, from
the Trim pin to output pin for margining-down. Figure
43 shows the circuit configuration for output voltage
margining. The POL Programming Tool, available at
www.lineagepower.com under the Downloads section,
also calculates the values of R
margin-up
and R
margin-down
for a specific output voltage and % margin. Please
consult your local Lineage Power technical
representative for additional details.
Figure 43. Circuit Configuration for margining
Output voltage.
Digital Output Voltage Margining
Please see the Digital Feature Descriptions
section.
0
2
4
6
8
10
12
14
16
0.511.522.533.544.555.56
Input Voltage (v)
Output Voltage (V)
Lower
Upper
Vo
MODULE
SIG_GND
Trim
Q1
Rtrim
Rmargin-up
Q2
Rmargin-down
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 16
Output Voltage Sequencing
The power module includes a sequencing feature, EZ-
SEQUENCE that enables users to implement various
types of output voltage sequencing in their
applications. This is accomplished via an additional
sequencing pin. When not using the sequencing
feature, leave it unconnected.
The voltage applied to the SEQ pin should be scaled
down by the same ratio as used to scale the output
voltage down to the reference voltage of the module.
This is accomplished by an external resistive divider
connected across the sequencing voltage before it is
fed to the SEQ pin as shown in Fig. 44.
Figure 44. Circuit showing connection of the
sequencing signal to the SEQ pin.
When the scaled down sequencing voltage is applied
to the SEQ pin, the output voltage tracks this voltage
until the output reaches the set-point voltage. The final
value of the sequencing voltage must be set higher
than the set-point voltage of the module. The output
voltage follows the sequencing voltage on a one-to-
one basis. By connecting multiple modules together,
multiple modules can track their output voltages to the
voltage applied on the SEQ pin.
To initiate simultaneous shutdown of the modules, the
SEQ pin voltage is lowered in a controlled manner.
The output voltage of the modules tracks the voltages
below their set-point voltages on a one-to-one basis.
A valid input voltage must be maintained until the
tracking and output voltages reach ground potential.
Overcurrent Protection
To provide protection in a fault (output overload)
condition, the unit is equipped with internal
current-limiting circuitry and can endure current limiting
continuously. At the point of current-limit inception, the
unit enters hiccup mode. The unit operates normally
once the output current is brought back into its
specified range.
Digital Adjustable Overcurrent Warning
Please see the Digital Feature Descriptions
section.
Overtemperature Protection
To provide protection in a fault condition, the unit is
equipped with a thermal shutdown circuit. The unit will
shut down if the overtemperature threshold of
120oC(typ) is exceeded at the thermal reference point
Tref .Once the unit goes into thermal shutdown it will
then wait to cool before attempting to restart.
Digital Temperature Status via PMBus
Please see the Digital Feature Descriptions
section.
Digitally Adjustable Output Over and Under
Voltage Protection
Please see the Digital Feature Descriptions
section.
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout
limit, the module operation is disabled. The module
will begin to operate at an input voltage above the
undervoltage lockout turn-on threshold.
Digitally Adjustable Input Undervoltage
Lockout
Please see the Digital Feature Descriptions
section.
Digitally Adjustable Power Good Thresholds
Please see the Digital Feature Descriptions
section.
Synchronization
The module switching frequency can be synchronized
to a signal with an external frequency within a
specified range. Synchronization can be done by using
the external signal applied to the SYNC pin of the
module as shown in Fig. 45, with the converter being
synchronized by the rising edge of the external signal.
The Electrical Specifications table specifies the
requirements of the external SYNC signal. If the SYNC
pin is not used, the module should free run at the
default switching frequency. If synchronization is not
being used, connect the SYNC pin to GND.
MODULE
SYNC
GND
+
Figure 45. External source connections to
synchronize switching frequency of the module.
Measuring Output Current, Output Voltage
and Input Voltage
Please see the Digital Feature Descriptions
section.
100 pF
DLynx Module
R1=Rtrim
20K
SIG_GND
SEQ
SEQ
V
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 17
Dual Layout
Identical dimensions and pin layout of Analog and
Digital Micro DLynx modules permit migration from one
to the other without needing to change the layout. In
both cases the trim resistor is connected between trim
and signal ground. The output of the analog module
cannot be trimmed down to 0.45V
Power Good
The module provides a Power Good (PGOOD) signal
that is implemented with an open-drain output to
indicate that the output voltage is within the regulation
limits of the power module. The PGOOD signal will be
de-asserted to a low state if any condition such as
overtemperature, overcurrent or loss of regulation
occurs that would result in the output voltage going
±10% outside the setpoint value. The PGOOD terminal
can be connected through a pullup resistor (suggested
value 100KΩ) to a source of 5VDC or lower.
Tunable LoopTM
The module has a feature that optimizes transient
response of the module called Tunable LoopTM.
External capacitors are usually added to the output of
the module for two reasons: to reduce output ripple
and noise (see Figure 38) and to reduce output voltage
deviations from the steady-state value in the presence
of dynamic load current changes. Adding external
capacitance however affects the voltage control loop of
the module, typically causing the loop to slow down
with sluggish response. Larger values of external
capacitance could also cause the module to become
unstable.
The Tunable LoopTM allows the user to externally
adjust the voltage control loop to match the filter
network connected to the output of the module. The
Tunable LoopTM is implemented by connecting a series
R-C between the VS+ and TRIM pins of the module,
as shown in Fig. 46. This R-C allows the user to
externally adjust the voltage loop feedback
compensation of the module.
Figure. 46. Circuit diagram showing connection of
RTUME and CTUNE to tune the control loop of the
module.
Recommended values of RTUNE and CTUNE for different
output capacitor combinations are given in Tables 2
and 3. Table 3 shows the recommended values of
RTUNE and CTUNE for different values of ceramic output
capacitors up to 1000uF that might be needed for an
application to meet output ripple and noise
requirements. Selecting RTUNE and CTUNE according to
Table 3 will ensure stable operation of the module.
In applications with tight output voltage limits in the
presence of dynamic current loading, additional output
capacitance will be required. Table 3 lists
recommended values of RTUNE and CTUNE in order to
meet 2% output voltage deviation limits for some
common output voltages in the presence of a 10A to
20A step change (50% of full load), with an input
voltage of 12V.
Please contact your Lineage Power technical
representative to obtain more details of this feature as
well as for guidelines on how to select the right value
of external R-C to tune the module for best transient
performance and stable operation for other output
capacitance values or input voltages other than 12V.
Table 2. General recommended values of of RTUNE
and CTUNE for Vin=12V and various external
ceramic capacitor combinations.
Co 2x47μF4x47μF6x47μF 10x47μF20x47μF
RTUNE 330 330 270 220 180
CTUNE 47pF 560pF 1200pF 2200pF 4700pF
VS+
MODULE
SIG_GND
TRIM
VOUT
RTune
CTune
RTrim
CO
GND
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 18
Table 3. Recommended values of RTUNE and CTUNE
to obtain transient deviation of 2% of Vout for a
10A step load with Vin=12V.
Vo 5V 3.3V 2.5V 1.8V 1.2V 0.6V
Co 8x47μF
5x47
μ
F
+
1x330μF
Polymer
2x47
μ
F
+
2x330μF
Polymer
2x47
μ
F
+
3x330μF
Polymer
1x47
μ
F
+
5x330μF
Polymer
1x47
μ
F
+
11x330μF
Polymer
RTUNE 220 220 220 220 180 180
CTUNE 1500pF 2200pF 3300pF 5600pF 10nF 47nF
ΔV 100mV 64mV 49mV 36mV 24mV 12mV
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 19
Digital Feature Descriptions
PMBus Interface Capability
The 20A Digital Micro DLynxTM power modules have a
PMBus interface that supports both communication
and control. The PMBus Power Management Protocol
Specification can be obtained from www.pmbus.org.
The modules support a subset of version 1.1 of the
specification (see Table 6 for a list of the specific
commands supported). Most module parameters can
be programmed using PMBus and stored as defaults
for later use.
All communication over the module PMBus interface
must support the Packet Error Checking (PEC)
scheme. The PMBus master must generate the correct
PEC byte for all transactions, and check the PEC byte
returned by the module.
The module also supports the SMBALERT response
protocol whereby the module can alert the bus master
if it wants to talk. For more information on the SMBus
alert response protocol, see the System Management
Bus (SMBus) specification.
The module has non-volatile memory that is used to
store configuration settings. Not all settings
programmed into the device are automatically saved
into this non-volatile memory, only those specifically
identified as capable of being stored can be saved
(see Table 6 for which command parameters can be
saved to non-volatile storage).
PMBus Data Format
For commands that set thresholds, voltages or report
such quantities, the module supports the “Linear” data
format among the three data formats supported by
PMBus. The Linear Data Format is a two byte value
with an 11-bit, two’s complement mantissa and a 5-bit,
two’s complement exponent. The format of the two
data bytes is shown below:
Data Byte High
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
Data Byte Low
Exponent
MSB
Mantissa
MSB
The value is of the number is then given by
Value = Mantissa x 2 Exponent
PMBus Addressing
The power module can be addressed through the
PMBus using a device address. The module has 64
possible addresses (0 to 63 in decimal) which can be
set using resistors connected from the ADDR0 and
ADDR1 pins to GND. Note that some of these
addresses (0, 1, 2, 3, 4, 5, 6, 7, 8, 12, 40 in decimal)
are reserved according to the SMBus specifications
and may not be useable. The address is set in the
form of two octal (0 to 7) digits, with each pin setting
one digit. The ADDR1 pin sets the high order digit and
ADDR0 sets the low order digit. The resistor values
suggested for each digit are shown in Table 4 (1%
tolerance resistors are recommended). Note that if
either address resistor value is outside the range
specified in Table 4, the module will respond to
address 127.
Table 4
Digit Resistor Value (KΩ)
0 10
1 15.4
2 23.7
3 36.5
4 54.9
5 84.5
6 130
7 200
The user must know which I2C addresses are reserved
in a system for special functions and set the address of
the module to avoid interfering with other system
operations. Both 100kHz and 400kHz bus speeds are
supported by the module. Connection for the PMBus
interface should follow the High Power DC
specifications given in section 3.1.3 in the SMBus
specification V2.0 for the 400kHz bus speed or the
Low Power DC specifications in section 3.1.2. The
complete SMBus specification is available from the
SMBus web site, smbus.org.
A
DDR0
SIG GND
RADDR0 RADDR1
A
DDR1
Figure 47. Circuit showing connection of resistors
used to set the PMBus address of the module.
PMBus Enabled On/Off
The module can also be turned on and off via the
PMBus interface. The OPERATION command is used
to actually turn the module on and off via the PMBus,
while the ON_OFF_CONFIG command configures the
combination of analog ON/OFF pin input and PMBus
commands needed to turn the module on and off. Bit
[7] in the OPERATION command data byte enables
the module, with the following functions:
0 : Output is disabled
1 : Output is enabled
This module uses the lower five bits of the
ON_OFF_CONFIG data byte to set various ON/OFF
options as follows:
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 20
Bit Position 4 3 2 1 0
Access r/w r/w r/w r/w r
Function PU CMD CPR POL CPA
Default Value 1 0 1 1 1
PU: Sets the default to either operate any time input
power is present or for the ON/OFF to be controlled by
the analog ON/OFF input and the PMBus
OPERATION command. This bit is used together with
the CP, CMD and ON bits to determine startup.
Bit Value Action
0
Module powers up any time power is
present regardless of state of the analog
ON/OFF pin
1
Module does not power up until
commanded by the analog ON/OFF pin
and the OPERATION command as
programmed in bits [2:0] of the
ON_OFF_CONFIG register.
CMD: The CMD bit controls how the device responds
to the OPERATION command.
Bit Value Action
0 Module ignores the ON bit in the
OPERATION command
1 Module responds to the ON bit in the
OPERATION command
CPR: Sets the response of the analog ON/OFF pin.
This bit is used together with the CMD, PU and ON
bits to determine startup.
Bit Value Action
0
Module ignores the analog ON/OFF pin,
i.e. ON/OFF is only controlled through the
PMBUS via the OPERATION command
1 Module requires the analog ON/OFF pin
to be asserted to start the unit
PMBus Adjustable Soft Start Rise Time
The soft start rise time can be adjusted in the module
via PMBus. When setting this parameter, make sure
that the charging current for output capacitors can be
delivered by the module in addition to any load current
to avoid nuisance tripping of the overcurrent protection
circuitry during startup. The TON_RISE command sets
the rise time in ms, and allows choosing soft start
times between 600μs and 9ms, with possible values
listed in Table 5. Note that the exponent is fixed at -4
(decimal) and the upper two bits of the mantissa are
also fixed at 0.
Table 5
Rise Time Exponent Mantissa
600μs 11100 00000001010
900μs 11100 00000001110
1.2ms 11100 00000010011
1.8ms 11100 00000011101
2.7ms 11100 00000101011
4.2ms 11100 00001000011
6.0ms 11100 00001100000
9.0ms 11100 00010010000
Output Voltage Adjustment Using the PMBus
The VOUT_SCALE_LOOP parameter is important for
a number of PMBus commands related to output
voltage trimming, margining, over/under voltage
protection and the PGOOD thresholds. The output
voltage of the module is set as the combination of the
voltage divider formed by RTrim and a 20k upper
divider resistor inside the module, and the internal
reference voltage of the module. The reference voltage
VREF is nominally set at 600mV, and the output
regulation voltage is then given by
REFOUT V
RTrim
RTrim
V×
+
=20000
Hence the module output voltage is dependent on the
value of RTrim which is connected external to the
module. The information on the output voltage divider
ratio is conveyed to the module through the
VOUT_SCALE_LOOP parameter which is calculated
as follows:
RTrim
RTrim
LOOPSCALEVOUT +
=20000
__
The VOUT_SCALE_LOOP parameter is specified
using the “Linear” format and two bytes. The upper five
bits [7:3] of the high byte are used to set the exponent
which is fixed at –9 (decimal). The remaining three bits
of the high byte [2:0] and the eight bits of the lower
byte are used for the mantissa. The default value of
the mantissa is 00100000000 corresponding to 256
(decimal), corresponding to a divider ratio of 0.5. The
maximum value of the mantissa is 512 corresponding
to a divider ratio of 1. Note that the resolution of the
VOUT_SCALE_LOOP command is 0.2%.
When PMBus commands are used to trim or margin
the output voltage, the value of VREF is what is
changed inside the module, which in turn changes the
regulated output voltage of the module.
The nominal output voltage of the module can be
adjusted with a minimum step size of 0.4% over a
±25% range from nominal using the VOUT_TRIM
command over the PMBus.
The VOUT_TRIM command is used to apply a fixed
offset voltage to the output voltage command value
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 21
using the “Linear” mode with the exponent fixed at –10
(decimal). The value of the offset voltage is given by
10
)( 2_ −
×= TRIMVOUTV offsetOUT
This offset voltage is added to the voltage set through
the divider ratio and nominal VREF to produce the
trimmed output voltage. The valid range in two’s
complement for this command is –4000h to 3999h.
The high order two bits of the high byte must both be
either 0 or 1. If a value outside of the +/-25%
adjustment range is given with this command, the
module will set it’s output voltage to the nominal value
(as if VOUT_TRIM had been set to 0), assert
SMBALRT#, set the CML bit in STATUS_BYTE and
the invalid data bit in STATUS_CML.
Output Voltage Margining Using the PMBus
The module can also have its output voltage margined
via PMBus commands. The command
VOUT_MARGIN_HIGH sets the margin high voltage,
while the command VOUT_MARGIN_LOW sets the
margin low voltage. Both the VOUT_MARGIN_HIGH
and VOUT_MARGIN_LOW commands use the
“Linear” mode with the exponent fixed at –10
(decimal). Two bytes are used for the mantissa with
the upper bit [7] of the high byte fixed at 0. The actual
margined output voltage is a combination of the
VOUT_MARGIN_HIGH or VOUT_MARGIN_LOW and
the VOUT_TRIM values as shown below.
10
)(
2)___( −
×+
=
TRIMVOUTHIGHMARGINVOUT
VMHOUT
10
)(
2)___( −
×+
=
TRIMVOUTLOWMARGINVOUT
VMLOUT
Note that the sum of the margin and trim voltages
cannot be outside the ±25% window around the
nominal output voltage. The data associated with
VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW
can be stored to non-volatile memory using the
STORE_DEFAULT_ALL command.
The module is commanded to go to the margined high
or low voltages using the OPERATION command. Bits
[5:2] are used to enable margining as follows:
00XX : Margin Off
0101 : Margin Low (Ignore Fault)
0110 : Margin Low (Act on Fault)
1001 : Margin High (Ignore Fault)
1010 : Margin High (Act on Fault)
PMBus Adjustable Overcurrent Warning
The module can provide an overcurrent warning via
the PMBus. The threshold for the overcurrent warning
can be set using the parameter
IOUT_OC_WARN_LIMIT. This command uses the
“Linear” data format with a two byte data word where
the upper five bits [7:3] of the high byte represent the
exponent and the remaining three bits of the high byte
[2:0] and the eight bits in the low byte represent the
mantissa. The exponent is fixed at –1 (decimal). The
upper six bits of the mantissa are fixed at 0 while the
lower five bits are programmable with a default value
of TBD (decimal). The resolution of this warning limit is
500mA. The value of the IOUT_OC_WARN_LIMIT can
be stored to non-volatile memory using the
STORE_DEFAULT_ALL command.
Temperature Status via PMBus
The module can provide information related to
temperature of the module through the
STATUS_TEMPERATURE command. The command
returns information about whether the pre-set over
temperature fault threshold and/or the warning
threshold have been exceeded.
PMBus Adjustable Output Over and Under
Voltage Protection
The module has output over and under voltage
protection capability. The PMBus command
VOUT_OV_FAULT_LIMIT is used to set the output
over voltage threshold from four possible values:
108%, 110%, 112% or 115% of the commanded
output voltage. The command
VOUT_UV_FAULT_LIMIT sets the threshold that
causes an output under voltage fault and can also be
selected from four possible values: 92%, 90%, 88% or
85%. The default values are 112% and 88% of
commanded output voltage. Both commands use two
data bytes formatted as two’s complement binary
integers. The “Linear” mode is used with the exponent
fixed to –10 (decimal) and the effective over or under
voltage trip points given by:
10
)_(
10
)_(
2)___(
2)___(
−
−
×=
×=
LIMITFAULTUVVOUTV
LIMITFAULTOVVOUTV
REQUVOUT
REQOVOUT
Values within the supported range for over and
undervoltage detection thresholds will be set to the
nearest fixed percentage. Note that the correct value
for VOUT_SCALE_LOOP must be set in the module
for the correct over or under voltage trip points to be
calculated.
In addition to adjustable output voltage protection, the
12A Digital Pico DLynxTM module can also be
programmed for the response to the fault. The
VOUT_OV_FAULT RESPONSE and
VOUT_UV_FAULT_RESPONSE commands specify
the response to the fault. Both these commands use a
single data byte with the possible options as shown
below.
1. Continue operation without interruption (Bits
[7:6] = 00, Bits [5:3] = xxx)
2. Continue for four switching cycles and then
shut down if the fault is still present, followed
by no restart or continuous restart (Bits [7:6]
= 01, Bits [5:3] = 000 means no restart, Bits
[5:3] = 111 means continuous restart)
3. Immediate shut down followed by no restart
or continuous restart (Bits [7:6] = 10, Bits [5:3]
= 000 means no restart, Bits [5:3] = 111
means continuous restart).
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 22
4. Module output is disabled when the fault is
present and the output is enabled when the
fault no longer exists (Bits [7:6] = 11, Bits [5:3]
= xxx).
Note that separate response choices are possible for
output over voltage or under voltage faults.
PMBus Adjustable Input Undervoltage
Lockout
The module allows adjustment of the input under
voltage lockout and hysteresis. The command VIN_ON
allows setting the input voltage turn on threshold, while
the VIN_OFF command sets the input voltage turn off
threshold. For the VIN_ON command, possible values
are 2.75V, and 3V to 14V in 0.5V steps. For the
VIN_OFF command, possible values are 2.5V to 14V
in 0.5V steps. If other values are entered for either
command, they will be mapped to the closest of the
allowed values.
Both the VIN_ON and VIN_OFF commands use the
“Linear” format with two data bytes. The upper five bits
represent the exponent (fixed at -2) and the remaining
11 bits represent the mantissa. For the mantissa, the
four most significant bits are fixed at 0.
Power Good
The module provides a Power Good (PGOOD) signal
that is implemented with an open-drain output to
indicate that the output voltage is within the regulation
limits of the power module. The PGOOD signal will be
de-asserted to a low state if any condition such as
overtemperature, overcurrent or loss of regulation
occurs that would result in the output voltage going
outside the specified thresholds. The PGOOD
thresholds are user selectable via the PMBus (the
default values are as shown in the Feature
Specifications Section). Each threshold is set up
symmetrically above and below the nominal value. The
POWER_GOOD_ON command sets the output
voltage level above which PGOOD is asserted (lower
threshold). For example, with a 1.2V nominal output
voltage, the POWER_GOOD_ON threshold can set
the lower threshold to 1.14 or 1.1V. Doing this will
automatically set the upper thresholds to 1.26 or 1.3V.
The POWER_GOOD_OFF command sets the level
below which the PGOOD command is de-asserted.
This command also sets two thresholds symmetrically
placed around the nominal output voltage. Normally,
the POWER_GOOD_ON threshold is set higher than
the POWER_GOOD_OFF threshold.
Both POWER_GOOD_ON and POWER_GOOD_OFF
commands use the “Linear” format with the exponent
fixed at –10 (decimal). The two thresholds are given by
10
)_(
10
)_(
2)__(
2)__(
−
−
×=
×=
OFFGOODPOWERV
ONGOODPOWERV
OFFPGOODOUT
ONPGOODOUT
Both commands use two data bytes with bit [7] of the
high byte fixed at 0, while the remaining bits are r/w
and used to set the mantissa using two’s complement
representation. Both commands also use the The
VOUT_SCALE_LOOP parameter so it must be set
correctly. The default value of POWER_GOOD_ON is
set at 1.1035V and that of the POWER_GOOD_OFF is
set at 1.08V. The values associated with these
commands can be stored in non-volatile memory using
the STORE_DEFAULT_ALL command.
PGOOD terminal can be connected through a pullup
resistor (suggested value 100KΩ) to a source of 5VDC
or lower.
Measurement of Output Current, Output
Voltage and Input Voltage
The module is capable of measuring key module
parameters such as output current and voltage and
input voltage and providing this information through the
PMBus interface. Roughly every 200s, the module
makes 16 measurements each of output current,
voltage and input voltage. Average values of each of
these measurements are then calculated and placed in
the appropriate registers. These values in the registers
can then be read using the PMBus interface.
Measuring Output Current Using the PMBus
The module measures current by using the inductor
winding resistance as a current sense element. The
inductor winding resistance is then the current gain
factor used to scale the measured voltage into a
current reading. This gain factor is the argument of the
IOUT_CAL_GAIN command, and consists of two bytes
in the linear data format. The exponent uses the upper
five bits [7:3] of the high data byte in two-s
complement format and is fixed at –15 (decimal). The
remaining 11 bits in two’s complement binary format
represent the mantissa. During manufacture, each
module is calibrated by measuring and storing the
current gain factor into non-volatile storage.
The current measurement accuracy is also improved
by each module being calibrated during manufacture
with the offset in the current reading. The
IOUT_CAL_OFFSET command is used to store and
read the current offset. The argument for this
command consists of two bytes composed of a 5-bit
exponent (fixed at -4d) and a 11-bit mantissa. This
command has a resolution of 62.5mA and a range of
-4000mA to +3937.5mA.
The READ_IOUT command provides module average
output current information. This command only
supports positive or current sourced from the module.
If the converter is sinking current a reading of 0 is
provided. The READ_IOUT command returns two
bytes of data in the linear data format. The exponent
uses the upper five bits [7:3] of the high data byte in
two-s complement format and is fixed at –4 (decimal).
The remaining 11 bits in two’s complement binary
format represent the mantissa with the 11th bit fixed at
0 since only positive numbers are considered valid.
Note that the current reading provided by the module
is not corrected for temperature. The temperature
corrected current reading for module temperature
TModule can be estimated using the following equation
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 23
, _
.
where IOUT_CORR is the temperature corrected value of
the current measurement, IREAD_OUT is the module
current measurement value, TIND is the temperature of
the inductor winding on the module. Since it may be
difficult to measure TIND, it may be approximated by an
estimate of the module temperature.
Measuring Output Voltage Using the PMBus
The module can provide output voltage information
using the READ_VOUT command. The command
returns two bytes of data all representing the mantissa
while the exponent is fixed at -10 (decimal).
During manufacture of the module, offset and gain
correction values are written into the non-volatile
memory of the module. The command
VOUT_CAL_OFFSET can be used to read and/or
write the offset (two bytes consisting of a 16-bit
mantissa in two’s complement format) while the
exponent is always fixed at -10 (decimal). The allowed
range for this offset correction is -125 to 124mV. The
command VOUT_CAL_GAIN can be used to read
and/or write the gain correction - two bytes consisting
of a five-bit exponent (fixed at -8) and a 11-bit
mantissa. The range of this correction factor is -0.125
to +0.121, with a resolution of 0.004. The corrected
output voltage reading is then given by:
OFFSETCALVOUT
GAINCALVOUTadingInitialV
adingFinalV
OUT
OUT
__
)]__1()Re_([
)Re_(
+
+×
=
.
Measuring Input Voltage Using the PMBus
The module can provide output voltage information
using the READ_VIN command. The command returns
two bytes of data in the linear format. The upper five
bits [7:3] of the high data form the two’s complement
representation of the mantissa which is fixed at –5
(decimal). The remaining 11 bits are used for two’s
complement representation of the mantissa, with the
11th bit fixed at zero since only positive numbers are
valid.
During module manufacture, offset and gain correction
values are written into the non-volatile memory of the
module. The command VIN_CAL_OFFSET can be
used to read and/or write the offset - two bytes
consisting of a five-bit exponent (fixed at -5) and a11-
bit mantissa in two’s complement format. The allowed
range for this offset correction is -2to 1.968V, and the
resolution is 32mV. The command VIN_CAL_GAIN
can be used to read and/or write the gain correction -
two bytes consisting of a five-bit exponent (fixed at -8)
and a 11-bit mantissa. The range of this correction
factor is -0.125 to +0.121, with a resolution of 0.004.
The corrected output voltage reading is then given by:
OFFSETCALVIN
GAINCALVINadingInitialV
adingFinalV
IN
IN
__
)]__1()Re_([
)Re_(
+
+×
=
Reading the Status of the Module using the
PMBus
The module supports a number of status information
commands implemented in PMBus. However, not all
features are supported in these commands. A 1 in the
bit position indicates the fault that is flagged.
STATUS_BYTE : Returns one byte of information with
a summary of the most critical device faults.
Bit
Position Flag Default
Value
7 X 0
6 OFF 0
5 VOUT Overvoltage 0
4 IOUT Overcurrent 0
3 VIN Undervoltage 0
2 Temperature 0
1 CML (Comm. Memory Fault) 0
0 None of the above 0
STATUS_WORD: Returns two bytes of information
with a summary of the module’s fault/warning
conditions.
Low Byte
Bit
Position Flag Default
Value
7 X 0
6 OFF 0
5 VOUT Overvoltage 0
4 IOUT Overcurrent 0
3 VIN Undervoltage 0
2 Temperature 0
1 CML (Comm. Memory Fault) 0
0 None of the above 0
High Byte
Bit
Position Flag Default
Value
7 VOUT fault or warning 0
6 IOUT fault or warning 0
5 X 0
4 X 0
3 POWER_GOOD# (is negated) 0
2 X 0
1 X 0
0 X 0
STATUS_VOUT : Returns one byte of information
relating to the status of the module’s output voltage
related faults.
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 24
Bit
Position Flag Default
Value
7 VOUT OV Fault 0
6 X 0
5 X 0
4 VOUT UV Fault 0
3 X 0
2 X 0
1 X 0
0 X 0
STATUS_IOUT : Returns one byte of information
relating to the status of the module’s output voltage
related faults.
Bit
Position Flag Default
Value
7 IOUT OC Fault 0
6 X 0
5 IOUT OC Warning 0
4 X 0
3 X 0
2 X 0
1 X 0
0 X 0
STATUS_TEMPERATURE : Returns one byte of
information relating to the status of the module’s
temperature related faults.
Bit
Position Flag Default
Value
7 OT Fault 0
6 OT Warning 0
5 X 0
4 X 0
3 X 0
2 X 0
1 X 0
0 X 0
STATUS_CML : Returns one byte of information
relating to the status of the module’s communication
related faults.
Bit
Position Flag Default
Value
7 Invalid/Unsupported Command 0
6 Invalid/Unsupported Command 0
5 Packet Error Check Failed 0
4 X 0
3 X 0
2 X 0
1 Other Communication Fault 0
0 X 0
MFR_VIN_MIN : Returns minimum input voltage as
two data bytes of information in Linear format (upper
five bits are exponent – fixed at -2, and lower 11 bits
are mantissa in two’s complement format – fixed at 12)
MFR_VOUT_MIN : Returns minimum output voltage
as two data bytes of information in Linear format
(upper five bits are exponent – fixed at -10, and lower
11 bits are mantissa in two’s complement format –
fixed at 614)
MFR_SPECIFIC_00 : Returns information related to
the type of module and revision number. Bits [7:2] in
the Low Byte indicate the module type (000010
corresponds to the UDT020 series of module), while
bits [7:3] indicate the revision number of the module.
Low Byte
Bit
Position Flag Default
Value
7:2 Module Name 000010
1:0 Reserved 10
High Byte
Bit
Position Flag Default
Value
7:3 Module Revision Number None
2:0 Reserved 000
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 25
Summary of Supported PMBus Commands
Please refer to the PMBus 1.1 specification for more details of these commands.
Table 6
Hex
Code Command Brief Description
Non-Volatile
Memory
Storage
01 OPERATION
Turn Module on or off. Also used to margin the output voltage
Format Unsigned Binary
Bit Position 7 6 5 4 3 2 1 0
A
ccess r/w r r/w r/w r/w r/w r r
Function On X Margin X X
Default Value 0 0 0 0 0 0 X X
02 ON_OFF_CONFIG
Configures the ON/OFF functionality as a combination of analog ON/OFF
pin and PMBus commands
Format Unsigned Binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r r/w r/w r/w r/w r
Function X X X pu cmd pol cpa X
Default Value 0 0 0 1 0 1 1 1
YES
03 CLEAR_FAULTS
Clear any fault bits that may have been set, also releases the SMBALERT#
signal if the device has been asserting it.
10 WRITE_PROTECT
Used to control writing to the module via PMBus. Copies the current register
setting in the module whose command code matches the value in the data
byte into non-volatile memory (EEPROM) on the module
Format Unsigned Binary
Bit Position 7 6 5 4 3 2 1 0
Access r/w r/w r/w xxx x x
Function bit7 bit6 bit5 X X X X X
Default Value 0 0 0 X X X X X
Bit5: 0 – Enables all writes as permitted in bit6 or bit7
1 – Disables all writes except the WRITE_PROTECT, OPERATION
and ON_OFF_CONFIG (bit 6 and bit7 must be 0)
Bit 6: 0 – Enables all writes as permitted in bit5 or bit7
1 – Disables all writes except for the WRITE_PROTECT and
OPERATION commands (bit5 and bit7 must be 0)
Bit7: 0 – Enables all writes as permitted in bit5 or bit6
1 – Disables all writes except for the WRITE_PROTECT command
(bit5 and bit6 must be 0)
YES
11 STORE_DEFAULT_ALL
Copies all current register settings in the module into non-volatile memory
(EEPROM) on the module
12 RESTORE_DEFAULT_ALL
Restores all current register settings in the module from values in the
module non-volatile memory (EEPROM)
13 STORE_DEFAULT_CODE
Copies the current register setting in the module whose command code
matches the value in the data byte into non-volatile memory (EEPROM) on
the module
Bit Position 7 6 5 4 3 2 1 0
A
ccess w w w www w w
Function Command code
14 RESTORE_DEFAULT_CODE
Restores the current register setting in the module whose command code
matches the value in the data byte from the value in the module non-volatile
memory (EEPROM)
Bit Position 7 6 5 4 3 2 1 0
A
ccess w w w www w w
Function Command code
20 VOUT_MODE
The module has MODE set to Linear and Exponent set to -10. These values
cannot be changed
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Function Mode Exponent
Default Value 0 0 0 1 0 1 1 0
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 26
Table 6 (continued)
Hex
Code Command Brief Description
Non-
V
olatile
Memory
Storage
22 VOUT_TRIM
Apply a fixed offset voltage to the output voltage command value
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
Access r/w r/w r/w r/w r/w r/w r/w r/w
Function High Byte
Default Value 0 0 0 0 0 0 0 0
Bit Position 7 6 5 4 3 2 1 0
A
ccess r/w r/w r/w r/w r/w r/w r/w r/w
Function Low Byte
Default Value 0 0 0 0 0 0 0 0
YES
25 VOUT_MARGIN_HIGH
Sets the target voltage for margining the output high
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
Access r r/w r/w r/w r/w r/w r/w r/w
Function High Byte
Default Value 0 0 0 0 0 1 0 1
Bit Position 7 6 5 4 3 2 1 0
Access r/w r/w r/w r/w r/w r/w r/w r/w
Function Low Byte
Default Value 0 1 0 0 0 1 1 1
YES
26 VOUT_MARGIN_LOW
Sets the target voltage for margining the output low
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
A
ccess r r/w r/w r/w r/w r/w r/w r/w
Function High Byte
Default Value 0 0 0 0 0 1 0 0
Bit Position 7 6 5 4 3 2 1 0
Access r/w r/w r/w r/w r/w r/w r/w r/w
Function Low Byte
Default Value 0 1 0 1 0 0 0 1
YES
29 VOUT_SCALE_LOOP
Sets the scaling of the output voltage – equal to the feedback resistor
divider ratio
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
A
ccess r r r r r r r/w r/w
Function Exponent Mantissa
Default Value 1 0 1 1 1 0 0 1
Bit Position 7 6 5 4 3 2 1 0
Access r/w r/w r/w r/w r/w r/w r/w r/w
Function Mantissa
Default Value 0 0 0 0 0 0 0 0
YES
35 VIN_ON
Sets the value of input voltage at which the module turns on
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
A
ccess r r r r r r r r
Function Exponent Mantissa
Default Value 1 1 1 1 0 0 0 0
Bit Position 7 6 5 4 3 2 1 0
Access r r/w r/w r/w r/w r/w r/w r/w
Function Mantissa
Default Value 0 0 0 0 1 0 1 1
YES
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 27
Table 6 (continued)
Hex
Code Command Brief Description
Non-Volatile
Memory
Storage
36 VIN_OFF
Sets the value of input voltage at which the module turns off
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Function Exponent Mantissa
Default Value 1 1 1 1 0 0 0 0
Bit Position 7 6 5 4 3 2 1 0
Access r r/w r/w r/w r/w r/w r/w r/w
Function Mantissa
Default Value 0 0 0 0 1 0 1 0
YES
38 IOUT_CAL_GAIN
Returns the value of the gain correction term used to correct the measured
output current
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
A
ccess r r r r r r r r/w
Function Exponent Mantissa
Default Value 1 0 0 0 1 0 0 V
Bit Position 7 6 5 4 3 2 1 0
Access r/w r/w r/w r/w r/w r/w r/w r/w
Function Mantissa
Default Value V: Variable based on factory calibration
YES
39 IOUT_CAL_OFFSET
Returns the value of the offset correction term used to correct the measured
output current
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r/w r r
Function Exponent Mantissa
Default Value 1 1 1 0 0 V 0 0
Bit Position 7 6 5 4 3 2 1 0
Access r r r/w r/w r/w r/w r/w r/w
Function Mantissa
Default Value 0 0 V: Variable based on factory calibration
YES
40 VOUT_OV_FAULT_LIMIT
Sets the voltage level for an output overvoltage fault
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
Access r r/w r/w r/w r/w r/w r/w r/w
Function High Byte
Default Value 0 0 0 0 0 1 0 1
Bit Position 7 6 5 4 3 2 1 0
Access r/w r/w r/w r/w r/w r/w r/w r/w
Function Low Byte
Default Value 0 0 0 0 1 0 1 0
YES
41 VOUT_OV_FAULT_RESPONSE
Instructs the module on what action to take in response to a output
overvoltage fault
Format Unsigned Binary
Bit Position 7 6 5 4 3 2 1 0
Access r/w r/w r/w r/w r/w r r r
Function RSP
[1]
RSP
[0] RS[2] RS[1] RS[0] X X X
Default Value 1 1 1 1 1 1 0 0
YES
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 28
Table 6 (continued)
Hex
Code Command Brief Description
Non-
V
olatile
Memory
Storage
44 VOUT_UV_FAULT_LIMIT
Sets the voltage level for an output undervoltage fault
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
A
ccess r r/w r/w r/w r/w r/w r/w r/w
Function High Byte
Default Value 0 0 0 0 0 1 0 0
Bit Position 7 6 5 4 3 2 1 0
Access r/w r/w r/w r/w r/w r/w r/w r/w
Function Low Byte
Default Value 1 0 0 0 1 1 1 1
YES
45 VOUT_UV_FAULT_RESPONSE
Instructs the module on what action to take in response to a output
undervoltage fault
Format Unsigned Binary
Bit Position 7 6 5 4 3 2 1 0
Access r/w r/w r/w r/w r/w r r r
Function RSP
[1]
RSP
[0] RS[2] RS[1] RS[0] X X X
Default Value 0 0 0 0 0 1 0 0
YES
4A IOUT_OC_WARN_LIMIT
Sets the output overcurrent warning level in A
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Function Exponent Mantissa
Default Value 1 1 1 1 1 0 0 0
Bit Position 7 6 5 4 3 2 1 0
Access r r r/w r/w r/w r/w r/w r/w
Function Mantissa
Default Value 0 0 tbd tbd tbd tbd tbd tbd
YES
5E POWER_GOOD_ON
Sets the output voltage level at which the PGOOD pin is asserted high
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
Access r r/w r/w r/w r/w r/w r/w r/w
Function High Byte
Default Value 0 0 0 0 0 1 0 0
Bit Position 7 6 5 4 3 2 1 0
A
ccess r/w r/w r/w r/w r/w r/w r/w r/w
Function Low Byte
Default Value 0 1 1 0 1 0 1 0
YES
5F POWER_GOOD_OFF
Sets the output voltage level at which the PGOOD pin is de-asserted low
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
A
ccess r r/w r/w r/w r/w r/w r/w r/w
Function High Byte
Default Value 0 0 0 0 0 1 0 0
Bit Position 7 6 5 4 3 2 1 0
Access r/w r/w r/w r/w r/w r/w r/w r/w
Function Low Byte
Default Value 0 1 0 1 0 0 1 0
YES
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 29
Table 6 (continued)
Hex
Code Command Brief Description
Non-Volatile
Memory
Storage
61 TON_RISE
Sets the rise time of the output voltage during startup
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
A
ccess r r r r r r r r/w
Function Exponent Mantissa
Default Value 1 1 1 0 0 0 0 0
Bit Position 7 6 5 4 3 2 1 0
Access r/w r/w r/w r/w r/w r/w r/w r/w
Function Mantissa
Default Value 0 0 1 0 1 0 1 0
YES
78 STATUS_BYTE
Returns one byte of information with a summary of the most critical module
faults
Format Unsigned Binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Flag X OFF VOUT
_OV
IOUT
_OC
VIN_
UV TEMP CML OTHE
R
Default Value 0 0 0 0 0 0 0 0
79 STATUS_WORD
Returns two bytes of information with a summary of the module’s
fault/warning conditions
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
A
ccess r r r r r r r r
Flag VOUT IOUT
_OC X X
PGO
OD X X X
Default Value 0 0 0 0 0 0 0 0
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Flag X OFF
VOUT
_OV
IOUT
_OC
VIN_
UV TEMP CML OTHE
R
Default Value 0 0 0 0 0 0 0 0
7A STATUS_VOUT
Returns one byte of information with the status of the module’s output
voltage related faults
Format Unsigned Binary
Bit Position 7 6 5 4 3 2 1 0
A
ccess r r r r r r r r
Flag VOUT_OV X X VOUT_UV X X X X
Default Value 0 0 0 0 0 0 0 0
7B STATUS_IOUT
Returns one byte of information with the status of the module’s output
current related faults
Format Unsigned Binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Flag IOUT_OC X X X IOUT_OC_WARN X X X
Default Value 0 0 0 0 0 0 0 0
7D STATUS_TEMPERATURE
Returns one byte of information with the status of the module’s temperature
related faults
Format Unsigned Binary
Bit Position 7 6 5 4 3 2 1 0
A
ccess r r r r r r r r
Flag OT_FAULT OT_WARN X X X X X X
Default Value 0 0 0 0 0 0 0 0
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 30
Table 6 (continued)
Hex
Code Command Brief Description
Non-
V
olatile
Memory
Storage
7E STATUS_CML
Returns one byte of information with the status of the module’s
communication related faults
Format Unsigned Binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Flag Invalid
Command
Invalid
Data
PEC
Fail X X X
Other
Comm
Fault
X
Default Value 0 0 0 0 0 0 0 0
88 READ_VIN
Returns the value of the input voltage applied to the module
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
A
ccess r r r r r r r r
Function Exponent Mantissa
Default Value 1 1 0 1 1 0 0 0
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Function Mantissa
Default Value 0 0 0 0 0 0 0 0
8B READ_VOUT
Returns the value of the output voltage of the module
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
A
ccess r r r r r r r r
Function Mantissa
Default Value 0 0 0 0 0 0 0 0
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Function Mantissa
Default Value 0 0 0 0 0 0 0 0
8C READ_IOUT
Returns the value of the output current of the module
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Function Exponent Mantissa
Default Value 1 1 1 0 0 0 0 0
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Function Mantissa
Default Value 0 0 0 0 0 0 0 0
98 PMBUS_REVISION
Returns one byte indicating the module is compliant to PMBus Spec. 1.1
(read only)
Format Unsigned Binary
Bit Position 7 6 5 4 3 2 1 0
A
ccess r r r r r r r r
Default Value 0 0 0 1 0 0 0 1
YES
A0 MFR_VIN_MIN
Returns the minimum input voltage the module is specified to operate at
(read only)
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Function Exponent Mantissa
Default Value 1 1 1 1 0 0 0 0
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Function Mantissa
Default Value 0 0 0 0 1 1 0 0
YES
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 31
Table 6 (continued)
Hex
Code Command Brief Description
Non-Volatile
Memory
Storage
A4 MFR_VOUT_MIN
Returns the minimum output voltage possible from the module (read only)
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r rrrr r
Function Exponent Mantissa
Default Value 0 0 0 0 0 0 1 0
Bit Position 7 6 5 4 3 2 1 0
Access r r r rrrr r
Function Mantissa
Default Value 0 1 1 0 0 1 1 0
YES
D0 MFR_SPECIFIC_00
Returns module name and revision number information (read only)
Format Unsigned Binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r rrrr r
Function Module Revision Number Reserved
Default Value 1 1 1 0 1 0 0 0
Bit Position 7 6 5 4 3 2 1 0
Access r r r rrrr r
Function Module Name Reserved
Default Value 0 0 0 0 0 1 1 0
YES
D4 VOUT_CAL_OFFSET
Applies an offset to the READ_VOUT command results to calibrate out offset
errors in module measurements of the output voltage (between -125mV and
+124mV)
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
Access r/w r r rrrr r
Function Mantissa
Default Value V 0 0 0 0 0 0 0
Bit Position 7 6 5 4 3 2 1 0
Access r/w r/w r/w r/w r/w r/w r/w r/w
Function Mantissa
Default Value V V V V V V V V
YES
D5 VOUT_CAL_GAIN
Applies a gain correction to the READ_VOUT command results to calibrate out
gain errors in module measurements of the output voltage (between -0.125 and
0.121)
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r rrrr r/w
Function Exponent Mantissa
Default Value 1 1 0 0 0 0 0 V
Bit Position 7 6 5 4 3 2 1 0
Access r/w r/w r/w r/w r/w r/w r/w r/w
Function Mantissa
Default Value V V V V V V V V
YES
D6 VIN_CAL_OFFSET
Applies an offset correction to the READ_VIN command results to calibrate out
offset errors in module measurements of the input voltage (between -2V and
+1.968V)
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r rr/w rr r/w
Function Exponent Mantissa
Default Value 1 1 0 1 V 0 0 V
Bit Position 7 6 5 4 3 2 1 0
Access r r r/w r/w r/w r/w r/w r/w
Function Mantissa
Default Value 0 0 V V V V V V
YES
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 32
Table 6 (continued)
Hex
Code Command Brief Description
Non-Volatile
Memory
Storage
D7 VIN_CAL_GAIN
Applies a gain correction to the READ_VIN command results to calibrate out gain
errors in module measurements of the input voltage (between -0.125 and 0.121)
Format Linear, two’s complement binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r rr/w rr r/w
Function Exponent Mantissa
Default Value 1 1 0 0 V 0 0 V
Bit Position 7 6 5 4 3 2 1 0
Access r r r r/w r/w r/w r/w r/w
Function Mantissa
Default Value 0 0 0 V V V V V
YES
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 33
Thermal Considerations
Power modules operate in a variety of thermal
environments; however, sufficient cooling should
always be provided to help ensure reliable operation.
Considerations include ambient temperature, airflow,
module power dissipation, and the need for increased
reliability. A reduction in the operating temperature of
the module will result in an increase in reliability. The
thermal data presented here is based on physical
measurements taken in a wind tunnel. The test set-up
is shown in Figure 48. The preferred airflow direction
for the module is in Figure 49.
A
i
r
flow
x
Power Module
W
ind Tunnel
PWBs
12.7_
(0.50)
76.2_
(3.0)
Probe Location
for measuring
airflow and
ambient
temperature
25.4_
(1.0)
Figure 48. Thermal Test Setup.
The thermal reference points, Tref used in the
specifications are also shown in Figure 49. For reliable
operation the temperatures at these points should not
exceed 120oC. The output power of the module should
not exceed the rated power of the module (Vo,set x
Io,max).
Please refer to the Application Note “Thermal
Characterization Process For Open-Frame Board-
Mounted Power Modules” for a detailed discussion of
thermal aspects including maximum device
temperatures.
Figure 49. Preferred airflow direction and location
of hot-spot of the module (Tref).
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 34
Shock and Vibration
The ruggedized (-D version) of the modules are designed to withstand elevated levels of shock and vibration to be able
to operate in harsh environments. The ruggedized modules have been successfully tested to the following conditions:
Non operating random vibration:
Random vibration tests conducted at 25C, 10 to 2000Hz, for 30 minutes each level, starting from 30Grms (Z axis) and
up to 50Grms (Z axis). The units were then subjected to two more tests of 50Grms at 30 minutes each for a total of 90
minutes.
Operating shock to 40G per Mil Std. 810F, Method 516.4 Procedure I:
The modules were tested in opposing directions along each of three orthogonal axes, with waveform and amplitude of
the shock impulse characteristics as follows:
All shocks were half sine pulses, 11 milliseconds (ms) in duration in all 3 axes.
Units were tested to the Functional Shock Test of MIL-STD-810, Method 516.4, Procedure I - Figure 516.4-4. A shock
magnitude of 40G was utilized. The operational units were subjected to three shocks in each direction along three axes
for a total of eighteen shocks.
Operating vibration per Mil Std 810F, Method 514.5 Procedure I:
The ruggedized (-D version) modules are designed and tested to vibration levels as outlined in MIL-STD-810F, Method
514.5, and Procedure 1, using the Power Spectral Density (PSD) profiles as shown in Table 1 and Table 2 for all axes.
Full compliance with performance specifications was required during the performance test. No damage was allowed to
the module and full compliance to performance specifications was required when the endurance environment was
removed. The module was tested per MIL-STD-810, Method 514.5, Procedure I, for functional (performance) and
endurance random vibration using the performance and endurance levels shown in Table 4 and Table 5 for all axes.
The performance test has been split, with one half accomplished before the endurance test and one half after the
endurance test (in each axis). The duration of the performance test was at least 16 minutes total per axis and at least
120 minutes total per axis for the endurance test. The endurance test period was 2 hours minimum per axis.
Table 4: Performance Vibration Qualification - All Axes
Frequency
(Hz)
PSD Level
(G2/Hz)
Frequency
(Hz)
PSD Level
(G2/Hz)
Frequency
(Hz)
PSD Level
(G2/Hz)
10 1.14E-03 170 2.54E-03 690 1.03E-03
30 5.96E-03 230 3.70E-03 800 7.29E-03
40 9.53E-04 290 7.99E-04 890 1.00E-03
50 2.08E-03 340 1.12E-02 1070 2.67E-03
90 2.08E-03 370 1.12E-02 1240 1.08E-03
110 7.05E-04 430 8.84E-04 1550 2.54E-03
130 5.00E-03 490 1.54E-03 1780 2.88E-03
140 8.20E-04 560 5.62E-04 2000 5.62E-04
Table 5: Endurance Vibration Qualification - All Axes
Frequency
(Hz)
PSD Level
(G2/Hz)
Frequency
(Hz)
PSD Level
(G2/Hz)
Frequency
(Hz)
PSD Level
(G2/Hz)
10 0.00803 170 0.01795 690 0.00727
30 0.04216 230 0.02616 800 0.05155
40 0.00674 290 0.00565 890 0.00709
50 0.01468 340 0.07901 1070 0.01887
90 0.01468 370 0.07901 1240 0.00764
110 0.00498 430 0.00625 1550 0.01795
130 0.03536 490 0.01086 1780 0.02035
140 0.0058 560 0.00398 2000 0.00398
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 35
Example Application Circuit
Requirements:
Vin: 12V
Vout: 1.8V
Iout: 15A max., worst case load transient is from 10A to 15A
ΔVout: 1.5% of Vout (27mV) for worst case load transient
Vin, ripple 1.5% of Vin (180mV, p-p)
CI1 3x22μF/16V ceramic capacitor (e.g. Murata GRM32ER61C226KE20)
CI2 47μF/16V bulk electrolytic
CO1 N.A.
CO2 3 x 330μF/6.3V Polymer (e.g. Sanyo Poscap)
CTune 4700pF ceramic capacitor (can be 1206, 0805 or 0603 size)
RTune 330 ohms SMT resistor (can be 1206, 0805 or 0603 size)
RTrim 10kΩ SMT resistor (can be 1206, 0805 or 0603 size, recommended tolerance of 0.1%)
RADDR0
DATA
SEQ
VS-
RADDR1
GND
Vin+
CI2 CO2
A
DDR0
VOUT
VS+
GND
TRIM
CTUNE
RTUNE
RTrim
VIN
CO1
CI1
Vout+
ON/OFF
SEQ
SMBALRT#
MODULE
PGOOD
A
DDR1
SIG_GND
SYNC
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 36
Mechanical Outline
Dimensions are in millimeters and (inches).
Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.) [unless otherwise indicated]
x.xx mm ± 0.25 mm (x.xxx in ± 0.010 in.)
1 If unused, connect to Ground.
PIN FUNCTION PIN FUNCTION
1 ON/OFF 10 SYNC1
2 VIN 11 CLK
3 SEQ 12 DATA
4 GND 13 SMBALERT
5 TRIM 14 SIG_GND
6 VOUT 15 ADDR1
7 VS+ 16 ADDR0
8 VS-
9 PG
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 37
Recommended Pad Layout
Dimensions are in millimeters and (inches).
Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.) [unless otherwise indicated]
x.xx mm ± 0.25 mm (x.xxx in ± 0.010 in.)
2 If unused, connect to Ground.
PIN FUNCTION PIN FUNCTION
1 ON/OFF 10 SYNC2
2 VIN 11 CLK
3 SEQ 12 DATA
4 GND 13 SMBALERT
5 TRIM 14 SIG_GND
6 VOUT 15 ADDR1
7 VS+ 16 ADDR0
8 VS-
9 PG
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 38
Packaging Details
The 12V Digital Micro DLynxTM 20A modules are supplied in tape & reel as standard. Modules are shipped in
quantities of 200 modules per reel.
All Dimensions are in millimeters and (in inches).
Reel Dimensions:
Outside Dimensions: 330.2 mm (13.00)
Inside Dimensions: 177.8 mm (7.00”)
Tape Width: 44.00 mm (1.732”)
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
LINEAGE POWER 39
Surface Mount Information
Pick and Place
The 20A Digital Micro DLynxTM modules use an open
frame construction and are designed for a fully
automated assembly process. The modules are fitted
with a label designed to provide a large surface area
for pick and place operations. The label meets all the
requirements for surface mount processing, as well as
safety standards, and is able to withstand reflow
temperatures of up to 300oC. The label also carries
product information such as product code, serial
number and the location of manufacture.
Nozzle Recommendations
The module weight has been kept to a minimum by
using open frame construction. Variables such as
nozzle size, tip style, vacuum pressure and placement
speed should be considered to optimize this process.
The minimum recommended inside nozzle diameter
for reliable operation is 3mm. The maximum nozzle
outer diameter, which will safely fit within the allowable
component spacing, is 7 mm.
Bottom Side / First Side Assembly
This module is not recommended for assembly on the
bottom side of a customer board. If such an assembly
is attempted, components may fall off the module
during the second reflow process. If assembly on the
bottom side is planned, please contact Lineage Power
for special manufacturing process instructions.
Lead Free Soldering
The modules are lead-free (Pb-free) and RoHS
compliant and fully compatible in a Pb-free soldering
process. Failure to observe the instructions below
may result in the failure of or cause damage to the
modules and can adversely affect long-term reliability.
Pb-free Reflow Profile
Power Systems will comply with J-STD-020 Rev. C
(Moisture/Reflow Sensitivity Classification for
Nonhermetic Solid State Surface Mount Devices) for
both Pb-free solder profiles and MSL classification
procedures. This standard provides a recommended
forced-air-convection reflow profile based on the
volume and thickness of the package (table 4-2). The
suggested Pb-free solder paste is Sn/Ag/Cu (SAC).
For questions regarding Land grid array(LGA)
soldering, solder volume; please contact Lineage
Power for special manufacturing process instructions.
The recommended linear reflow profile using Sn/Ag/Cu
solder is shown in Fig. 50. Soldering outside of the
recommended profile requires testing to verify results
and performance.
MSL Rating
The 20A Digital Micro DLynxTM modules have a MSL
rating of 2.
Storage and Handling
The recommended storage environment and handling
procedures for moisture-sensitive surface mount
packages is detailed in J-STD-033 Rev. A (Handling,
Packing, Shipping and Use of Moisture/Reflow
Sensitive Surface Mount Devices). Moisture barrier
bags (MBB) with desiccant are required for MSL
ratings of 2 or greater. These sealed packages should
not be broken until time of use. Once the original
package is broken, the floor life of the product at
conditions of ≤ 30°C and 60% relative humidity varies
according to the MSL rating (see J-STD-033A). The
shelf life for dry packed SMT packages will be a
minimum of 12 months from the bag seal date, when
stored at the following conditions: < 40° C, < 90%
relative humidity.
Figure 50. Recommended linear reflow profile
using Sn/Ag/Cu solder.
Post Solder Cleaning and Drying
Considerations
Post solder cleaning is usually the final circuit-board
assembly process prior to electrical board testing. The
result of inadequate cleaning and drying can affect
both the reliability of a power module and the testability
of the finished circuit-board assembly. For guidance on
appropriate soldering, cleaning and drying procedures,
refer to Board Mounted Power Modules: Soldering and
Cleaning Application Note (AN04-001).
Per J-STD-020 Rev. C
0
50
100
150
200
250
300
Reflow Time (Seconds)
Reflow Temp (°C)
Heating Zone
1°C/Se cond
Peak Temp 260°C
* Min. Time Above 235°C
15 Seconds
*Time Above 217°C
60 Seconds
Cooling
Zone
Preliminary Data Sheet
June 15, 2011
20A Digital Micro DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
LINEAGE POWER 40
Document No: DS10-010 ver. 0.21
PDF name: UDT020A0X.pdf
Ordering Information
Please contact your Lineage Power Sales Representative for pricing, availability and optional features.
Table 7. Device Codes
Device Code Input
Voltage Range
Output
Voltage
Output
Current
On/Off
Logic Sequencing Comcodes
UDT020A0X3-SRZ 3 – 14.4Vdc 0.45 – 5.5Vdc 20A Negative Yes CC109159728
UDT020A0X3-SRDZ 3 – 14.4Vdc 0.45 – 5.5Vdc 20A Negative Yes CC109168745
UDT020A0X43-SRZ 3 – 14.4Vdc 0.45 – 5.5Vdc 20A Positive Yes CC109159736
-Z refers to RoHS compliant parts
Table 8. Coding Scheme
Lineage Power Digital Non-Isolated DC-DC products use technology licensed from Power-One, protected by US patents: US20040246754, US2004090219A1,
US2004093533A1, US2004123164A1, US2004123167A1, US2004178780A1, US2004179382A1, US20050200344, US20050223252, US2005289373A1, US20060061214,
US2006015616A1, US20060174145, US20070226526, US20070234095, US20070240000, US20080052551, US20080072080, US20080186006, US6741099, US6788036,
US6936999, US6949916, US7000125, US7049798, US7068021, US7080265, US7249267, US7266709, US7315156, US7372682, US7373527, US7394445, US7456617,
US7459892, US7493504, US7526660.
Outside the US the Power-One licensed technology is protected by patents: AU3287379AA, AU3287437AA, AU3290643AA, AU3291357AA, CN10371856C,
CN1045261OC, CN10458656C, CN10459360C, CN10465848C, CN11069332A, CN11124619A, CN11346682A, CN1685299A, CN1685459A, CN1685582A, CN1685583A,
CN1698023A, CN1802619A, EP1561156A1, EP1561268A2, EP1576710A1, EP1576711A1, EP1604254A4, EP1604264A4, EP1714369A2, EP1745536A4, EP1769382A4,
EP1899789A2, EP1984801A2, W004044718A1, W004045042A3, W004045042C1, W004062061 A1, W004062062A1, W004070780A3, W004084390A3, W004084391A3,
W005079227A3, W005081771A3, W006019569A3, W02007001584A3, W02007094935A3
Package
Identifier
Family Sequencing
Option
Output
current
Output
voltage
On/Off
logic
Remote
Sense Options
ROHS
Compliance
U D T 020A0 X 3 -SR -D Z
P=Pico
U=Micro
M=Mega
G=Giga
D=Dlynx
Digital
V =
DLynx
Analog.
T=with EZ
Sequence
X=without
sequencing
20A X =
programm
able output
4 =
positive
No entry
=
negative
3 =
Remote
Sense
S =
Surface
Mount
R =
Tape &
Reel
D = 105°C
operating
ambient,
40G
operating
shock as
per MIL
Std 810F
Z = ROHS6
World Wide Headquarters
Lineage Power Corporation
601 Shiloh Road, Plano, TX 75074, USA
+1-888-LINEAGE(546-3243)
(Outside U.S.A.: +1-972-244-WATT(9288))
www.lineagepower.com
e-mail: techsupport1@lineagepower.com
Asia-Pacific Headquarters
Tel: +86.021.54279977*808
Europe, Middle-East and Africa Headquarters
Tel: +49.89.878067-280
India Headquarters
Tel: +91.80.28411633
Lineage Power reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or
a
pplication. No rights under any patent accompany the sale of any such product(s) or information.
Lineage Power DC-DC products are protected under various patents. Information on these patents is available at www.lineagepower.com/patents.
©
2011 Lineage Power Corporation, (Plano, Texas) All International Rights Reserved.
